Versions 1.4.11 and 1.6.5 of Wireshark were published to patch multiple vulnerabilities found in previous editions. Flaws allowed to launch DoS attack and compromise user’s system. Memory leaks, program crashes and erros when processing checksums were fixed.
Flaws were found in versions 1.4.0 to 1.4.10 and 1.6.0 to 1.6.4.
Fixed Wireshark versions were published for Windows, Macintosh and Linux platforms.

source: Heise Online
12.01.2012